\\[-1.8ex] Soil Heterogeneity & $-$0.491$^{***}$ & $-$0.365$^{**}$ & $-$0.417$^{***}$ & $-$0.278$^{*}$ & $-$0.469$^{***}$ & $-$0.232 \\ 
  & (0.186) & (0.177) & (0.161) & (0.149) & (0.180) & (0.142) \\ 
\\[-1.8ex] 
Observations & 14,636 & 14,636 & 14,636 & 14,636 & 14,636 & 14,636 \\ 
R$^{2}$ & 0.366 & 0.418 & 0.385 & 0.431 & 0.369 & 0.450 \\ 
